The geography of the city of Toronto, Ontario, Canada, covers an area of 630 km² (243 sq mi) and is bounded by Lake Ontario to the south, Etobicoke Creek and Highway 427 to the west, Steeles Avenue to the north, and the Rouge River to the east. In addition to Etobicoke Creek and the Rouge River, the city is trisected by two minor rivers and their tributaries, the Humber River in the west end and the Don River east of downtown. Both flow southward to Lake Ontario at Humber Bay and Toronto Harbour respectively, which are part of the longerWaterfront. The concentration and protection of Toronto's ravines allows for large tracts of densely forested valleys with recreational trails within the city. Approximately 26–28% of Toronto is covered with over 10 million trees,^[1] a fairly high percentage within a large city in North America and there are ambitious proposals to double the coverage.

passive tense

is bounded by /   is trisected by  /  is covered with /   

active tense
Lake Ontario bounds Toronto.
Two minor rivers and their tributaries trisects Toronto.
Over 10 million trees covers Toronto  approximately 26–28%.